Evidence of Double Phonon Excitations in 16O + 208Pb Reaction
M. Dasgupta, K. Hagino, C. R. Morton, D. J. Hinde, J. R. Leigh, N. Takigawa, H. Timmers, J. O. Newton
Abstract
The fusion cross-sections for 16O + 208Pb, measured to high precision, enable the extraction of the distribution of fusion barriers. This shows a structure markedly different from the single-barrier which might be expected for fusion of two doubly-closed shell nuclei. The results of exact coupled channel calculations performed to understand the observations are presented. These calculations indicate that coupling to a double octupole phonon excited state in 208Pb is necessary to explain the experimental barrier distributions.
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